Critical dimension for the dislocation structure in deformed copper micropillars

X. X. Zhao; J. Wu; Y. L. Chiu; I. P. Jones; R. Gu; A. H.W. Ngan

doi:10.1016/j.scriptamat.2019.01.020

Critical dimension for the dislocation structure in deformed copper micropillars

X. X. Zhao, J. Wu^*, Y. L. Chiu, I. P. Jones, R. Gu, A. H.W. Ngan

^*Corresponding author for this work

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Although the effect of specimen size on strength has been well documented for metal micro-samples significantly larger than ~1 μm, less is known about the deformation induced dislocation structure, especially just above the size at which dislocation starvation happens. Here, uniaxial compression tests were performed on cylindrical [011] oriented copper micropillars with diameters of 1 μm, 3 μm and 5 μm. Dislocation cells formed in a fractal geometry in the 3 μm and 5 μm pillars, while dislocations were not retained in the 1 μm pillars. The effects of strain and strain rate on cell formation were also investigated.

Original language	English
Pages (from-to)	137-141
Number of pages	5
Journal	Scripta Materialia
Volume	163
Early online date	22 Jan 2019
DOIs	https://doi.org/10.1016/j.scriptamat.2019.01.020
Publication status	Published - 1 Apr 2019

Keywords

Copper
Dislocation cell
Focussed ion beam (FIB)
Fractal
Micropillar

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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https://www.sciencedirect.com/science/article/pii/S1359646219300375Licence: None: All rights reserved

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title = "Critical dimension for the dislocation structure in deformed copper micropillars",

abstract = "Although the effect of specimen size on strength has been well documented for metal micro-samples significantly larger than ~1 μm, less is known about the deformation induced dislocation structure, especially just above the size at which dislocation starvation happens. Here, uniaxial compression tests were performed on cylindrical [011] oriented copper micropillars with diameters of 1 μm, 3 μm and 5 μm. Dislocation cells formed in a fractal geometry in the 3 μm and 5 μm pillars, while dislocations were not retained in the 1 μm pillars. The effects of strain and strain rate on cell formation were also investigated.",

keywords = "Copper, Dislocation cell, Focussed ion beam (FIB), Fractal, Micropillar",

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T1 - Critical dimension for the dislocation structure in deformed copper micropillars

AU - Zhao, X. X.

AU - Wu, J.

AU - Chiu, Y. L.

AU - Jones, I. P.

AU - Gu, R.

AU - Ngan, A. H.W.

PY - 2019/4/1

Y1 - 2019/4/1

N2 - Although the effect of specimen size on strength has been well documented for metal micro-samples significantly larger than ~1 μm, less is known about the deformation induced dislocation structure, especially just above the size at which dislocation starvation happens. Here, uniaxial compression tests were performed on cylindrical [011] oriented copper micropillars with diameters of 1 μm, 3 μm and 5 μm. Dislocation cells formed in a fractal geometry in the 3 μm and 5 μm pillars, while dislocations were not retained in the 1 μm pillars. The effects of strain and strain rate on cell formation were also investigated.

AB - Although the effect of specimen size on strength has been well documented for metal micro-samples significantly larger than ~1 μm, less is known about the deformation induced dislocation structure, especially just above the size at which dislocation starvation happens. Here, uniaxial compression tests were performed on cylindrical [011] oriented copper micropillars with diameters of 1 μm, 3 μm and 5 μm. Dislocation cells formed in a fractal geometry in the 3 μm and 5 μm pillars, while dislocations were not retained in the 1 μm pillars. The effects of strain and strain rate on cell formation were also investigated.

KW - Copper

KW - Dislocation cell

KW - Focussed ion beam (FIB)

KW - Fractal

KW - Micropillar

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DO - 10.1016/j.scriptamat.2019.01.020

M3 - Article

AN - SCOPUS:85060249549

SN - 1359-6462

VL - 163

SP - 137

EP - 141

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Critical dimension for the dislocation structure in deformed copper micropillars

Abstract

Keywords

ASJC Scopus subject areas

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